Paper-perforator.



A. & C. DOM.

PAPER PERFORATOR.

APPLICATION FlLED JUNE7. 95.

Patented Sept. 21, 19 15.

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unrrnn sa'arns `g g ALEXANDER DOIVI AND CHESLEY DOM, OF

.CINCINNATL OHIO, ASSIGNORS TO THE SAIVIUEL C. TATUIVI COMPANY; OF CINCINNATI, OHIO, A CORPOEATION OF OHIO.

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Application filed June 7, 1915.

To all wom it may concern;-

Be it known that we, ALEXANDER DOM and CHESLEY DOM, citizens of theUnited States and residing at Cincinnati, in the county of? Hamilton and State of Ohio, have invented" a new and useful Improvement in Paper-" Perforators, of which the following specification is a full disclosure; r

The invention relates to an improvement in perforators 'and primarily to a hand operated type for desk use in pe'rforatng Sheets of paper.` As disclosed, it prov des a perforator, very simple in constructiom with a few number of parts conveniently assembled, and of increased durability over others' in the commercial field for Similar purposes. ln the style represented; the' punch supporting members are integral W1th' their supporting base for a definte punch spacing. Other styles'fo-r a: `selective punch spacing, `having their punch contaimng' heads adjustable, are comprehended and within the aspect of this invention, which is pr marily directed to the devices for reciprocating the punch members and in the punch or 1ts shank construction.

An obj ect, therefore, of the inventon 15 to provide a perfor'ator with 'a rock shaft ournaled in the punch supporting members having a groove longitudinal'ly there nto meshingly receive a tooth formed within the' circumference of the punch or its shank as a motion converting connection or transmitting connection between the parts, whereby the punch is reciprpcated upon rocking the shaft, and thereby for-ms a verystrong le- Vel' connection, and also restrcts the movement of the parts, without the use of auxiliary devices for Connecting or confining purposes. F

Various other features and ob ects of the invention will be more fully set forth in the description of the accompanying drawings, forming a part of this specification, and 11'1 such drawings like characters of reference denote corresponding parts throughout the several Views of which Figure 1 is a top plan view of the perforator. Fig. 2 is a section on line 2-2, Fig. 1. Fig. 3 is an end elevation. Fig. 4 lS a per- Spective view of a punch member.

The perforator, as illustrated, provides a base 1, and two punch supporting heads 2, 3, cast integral with the base 1, but such construction is only incident to a particular Specification of Letters Patent. Pate med Sgpt, 21, 13151 Seria1No.32,527.

style, it being obvious thatthe invention herein is applicable in any form of head construction or its method of mounting. The heads and their base may also be made of sheet metal stampings instead of from cast materialr Each head has its lower portion elongated forwardly and slightly raised fromthe upper surface of the base, terminating With a slot t, cut into the head as a paper receiving throat beneath 'the punch members. The gage of the slot is usually of a degree .Within a safe capacity that the parts of the device will withstand. The throat divides the punchand die elements or members of the perforator, the die herein J being represented by an orifice 5 in thebase, in registry with the movable pun'ch member mounted in 'the head; The die, however, may be in the nature of an insert, removably secured in position and of various design of perforating outline. The circular form herein illustrated is of the most common demand for this type of perforator. The shank 7 of the punch is milled to provide a tooth 9, eX-

tending transversely to the punch aXis with' the clearance forthe tooth' flanks cut 'in arcs from the base of the tooth toward the periphery of theshank and each preferably of a 'radius approximately equal to that of the rock shaft 10, which shaft journals in the heads normal to the punches. The shaft has a longitudinal groove 11 into which the tooth 9 meshes for reciprocating the punch with the rocking motion of the shaft. A single tooth engagement with the shaft in the form shown enables .the production of a large pitch of tooth and avoids shearing injury, as in cases wherein a plurality of fine pitch teeth are employed as rack and pinion. The coincidence of clearance are and shaft periphery provide stroke limits for the moving parts in either direction. Further, the. clearance surface registers and engages With V the periphery of the shaft under the wedgelike action to clampingly bind the shank within its bearing, and also shoulders the upper portion of the shank upon the shaft relieving the tooth of eXcessive strains at the stroke limits This is very advantageous and increases the life of the perforator and withstands the rough usage to which it is frequently subjected.

The single tooth connection presents quite 'ili l ment or plane of the punchends. ;l`he groove journaled in said bearings having a grooye longitudinally therein, a punch member for each bearing, each mova'bly supported'in its bearing to intercept the'throat slot .thereof `and normal to said shafi; having a tooth .transversely forrned thin its'emeunfer: ence, meshing With said shaft -gropye and curved fiank snrfaees atopppsitesides 'of the tooth each approximately ofa padius .sequal to that of the shaft adapted to alter: mtely u d pqn s shaft gnfix the punch movements.

' 2 111 a device of the class described, a

base, 'bearing members relatively -spaegl on said base each provided Witha threatslotf,

a shaft journaled in said bearing members; having `a groove longtud nally there n, a movable punch member th n a bear ng member av n a to th esh n 'With said shaft groove with an angnlar shaft shglder: ing tooth elearance 'surface adjace'nt ateqth flank for confiriing th p np mwema? wedgerlike elanping the pnnh shaft and bearing.

In a d v qe f ,the eham ter cle ibe a punch having ari upper notch anda'lower notch in its side, the upper side of the upper notch and the lower side of'the lower' notc'h being concave, but the other sides of.

the. notches being so shaped 'that a single YA toth is formed by the material of the punch left 'between the notches, a shaft havinga longitudina-l slot and' extending into the notches in .thepunch With the tooth received in the slot, and the concave s'ides of the.

r notches being arcspf radius substantially qua t -,th t o e ,shein h b hey form upper and lower steps, respectively, against the Shafii, for the pnchwhen said punch is ,depressed ,o a sedjby r a the r shaft with the tooth engaging in the slot,

and for operatively, supporting said' punch and said shaft.

:ah In a` device of the las des i edi p i ii frame t u t es a ha hi u n 'sa-id ram s u t v n a g oo e gtulnally' therein, pnnch member movable'within' said frame structure andnormal l ta shafi', having ,a tooth transversely "fermedtherein -meshingjwith said sha'ft -?995 9, and eurvedffiankedsurfaces at opposite -sidesoif the tooth, each approxirnately- 'of a radius eqaltglthat of the shaft, adapt-.'

ed to, alternately -shoulder 'pon said shaft V cenfining the punleh movements.

itness whereof, We hereunto subscribe r .14? nam s es eit t d by he w sb r g Wil QSS Se A x ALEXANDER DOM.

4 CHESLEY DOM. Witnesses 7 A ALBERT -T. lVINnEnMAnN, 

